# std::list<T,Allocator>::push_front

From cppreference.com
< cpp‎ | container‎ | list

void push_front( const T& value ); | (1) |
void push_front( T&& value ); | (2) | (since C++11)

Prepends the given element value to the beginning of the container.

No iterators or references are invalidated.

### Parameters

value | - | the value of the element to prepend

### Return value

(none)

### Complexity

Constant.

### Exceptions

If an exception is thrown for any reason, these functions have no effect (strong exception safety guarantee).

### Example

Run this code

    #include <list>
    #include <iomanip>
    #include <iostream>
    #include <string>

    int main()
    {
        std::list<std::string> letters;

        letters.push_front("abc");
        std::string s{"def"};
        letters.push_front(std::move(s));

        std::cout << "std::list letters holds: ";
        for (auto&& e : letters)
            std::cout << std::quoted(e) << ' ';

        std::cout << "\nMoved-from string s holds: " << std::quoted(s) << '\n';
    }

Possible output:

    std::list letters holds: "def" "abc"
    Moved-from string s holds: ""

### See also

emplace_front (C++11) | constructs an element in-place at the beginning (public member function)
push_back | adds an element to the end (public member function)
pop_front | removes the first element (public member function)
front_inserter | creates a std::front_insert_iterator of type inferred from the argument (function template)

Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/container/list/push_front&oldid=135225"